2023년 1월 3일 (화) 오후 9:46, Matthew Knepley <knepley at gmail.com>님이 작성:
> On Tue, Jan 3, 2023 at 7:22 AM 김성익 <ksi2443 at gmail.com> wrote:
>
>>
>>
>> 2023년 1월 3일 (화) 오후 8:55, Matthew Knepley <knepley at gmail.com>님이 작성:
>>
>>> On Tue, Jan 3, 2023 at 12:48 AM 김성익 <ksi2443 at gmail.com> wrote:
>>>
>>>> I got more questions so I resend this email with more questions.
>>>>
>>>> 1.After reconfigure by
>>>> ./arch-main-debug/lib/petsc/conf/reconfigure-arch-main-debug.py
>>>> --with-debugging=0 --PETSC_ARCH=arch-main-opt ,
>>>> I tried to build my code.
>>>>
>>>> But I got an error as below
>>>> [image: image.png]
>>>> How can I fix this?
>>>>
>>>
>>> You reconfigured with PETSC_ARCH=arch-main-opt, but your build is using
>>> "arch-linux-c-opt". Why are you changing it?
>>>
>>
>> At first Matthew told me use
>> './arch-main-debug/lib/petsc/conf/reconfigure-arch-main-debug.py
>> --with-debugging=0 --PETSC_ARCH=arch-main-opt' for build optimized.
>> However, I got an error the error is as below.
>>
>
> No, I did not say that. Here is the quote:
>
> Suppose your current arch is named "arch-main-debug".
>
> But your arch was not arch-imain-debug. Instead it was arch-linux-c-debug,
> which you used.
>
> [image: image.png]
>> So Barry told me : "The previous value of PETSC_ARCH was not
>> arch-main-debug do ls $PETSC_DIR and locate the directory whose name begins
>> with arch- that will tell you the previous value used for PETSC_ARCH."
>> So I used
>> "./arch-linux-c-debug/lib/petsc/conf/reconfigure-arch-linux-c-debug.py
>> --with-debugging=0 --PETSC_ARCH=arch-linux-c-opt"
>> That command worked. However I got an error when I build my code and the
>> error is as below.
>>
>
> Your build is saying that the library does not exist. After configuration,
> did you build the library?
>
> cd $PETSC_DIR
> PETSC_ARCH=arch-linux-c-opt make all
>
You are Right I didn't do build. So following your comments, I did build.
But, there are some errors when build my own code.
It didn't happen when in debug mode, but the following error occurred.
[image: image.png]
What could be the reason and how to fix it?
>
>> [image: image.png]
>>
>>
>>>
>>>>
>>>> 2.
>>>>
>>>> CFLAGS = -O3
>>>> FFLAGS =
>>>> CPPFLAGS =
>>>> FPPFLAGS =
>>>> COPTFLAGS = -march=native
>>>>
>>>>
>>>> app : a1.o a2.o a3.o a4.o
>>>> $(LINK.C) -o $@ $^ $(LDLIBS)
>>>>
>>>>
>>>> include ${PETSC_DIR}/lib/petsc/conf/rules
>>>> include ${PETSC_DIR}/lib/petsc/conf/test
>>>>
>>>> Upper makefile is just for build my own code not for src of petsc.
>>>> In this case, also has problem as your comments?
>>>>
>>>
>>> I do not understand your question.
>>>
>>
>> My questions is :
>> When building my own code without reconfigure of PETSc, I wonder if there
>> will be performance improvement by building with the high optimization
>> level of compiler even if the makefile is configured as above.
>>
>
> If significant time is spent in your code rather than PETSc, it is
> possible.
>
>
>>
>>>
>>>>
>>>> 3. I have no such processors. Where can I find benchmark information
>>>> about STREAMS?
>>>> I mean I don't have such various processors. So I just wondering the
>>>> results of STREAMS each processors (already existing results of various
>>>> processors).
>>>> Can anyone have results of benchmark of various desktop systems?
>>>>
>>>
>>> There are catalogues of STREAMS results online.
>>>
>>
>> Sorry, I can't find proper catalogues. What's the keyword for googling or
>> could you please give a link of catalogues?
>>
>
> https://www.cs.virginia.edu/stream/
>
> Thanks,
>
> Matt
>
>
>> Thanks,
>> Hyung Kim
>>
>>
>>
>>>
>>> Thanks,
>>>
>>> Matt
>>>
>>>
>>>> Thanks,
>>>> Hyung Kim
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> 2023년 1월 3일 (화) 오후 2:19, 김성익 <ksi2443 at gmail.com>님이 작성:
>>>>
>>>>> After reconfigure by
>>>>> ./arch-main-debug/lib/petsc/conf/reconfigure-arch-main-debug.py
>>>>> --with-debugging=0 --PETSC_ARCH=arch-main-opt ,
>>>>> I tried to build my code.
>>>>>
>>>>> But I got an error as below
>>>>> [image: image.png]
>>>>> How can I fix this?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> 2023년 1월 3일 (화) 오전 4:05, Barry Smith <bsmith at petsc.dev>님이 작성:
>>>>>
>>>>>>
>>>>>>
>>>>>> On Jan 2, 2023, at 9:27 AM, 김성익 <ksi2443 at gmail.com> wrote:
>>>>>>
>>>>>> There are more questions.
>>>>>>
>>>>>> 1. Following your comments, but there is an error as below.
>>>>>> <image.png>
>>>>>> How can I fix this?
>>>>>>
>>>>>>
>>>>>> The previous value of PETSC_ARCH was not arch-main-debug do ls
>>>>>> $PETSC_DIR and locate the directory whose name begins with arch- that will
>>>>>> tell you the previous value used for PETSC_ARCH.
>>>>>>
>>>>>>
>>>>>> 2. After changing the optimized build, then how can I set the debug
>>>>>> mode again?
>>>>>>
>>>>>>
>>>>>> export PETSC_ARCH=arch- whatever the previous value was and then
>>>>>> recompile your code (note you do not need to recompile PETSc just your
>>>>>> executable).
>>>>>>
>>>>>>
>>>>>> 3.Following your comments, the new makefile is as below. Is it right?
>>>>>> CFLAGS = -O3
>>>>>> FFLAGS =
>>>>>> CPPFLAGS =
>>>>>> FPPFLAGS =
>>>>>> COPTFLAGS = -march=native
>>>>>>
>>>>>>
>>>>>> app : a1.o a2.o a3.o a4.o
>>>>>> $(LINK.C) -o $@ $^ $(LDLIBS)
>>>>>>
>>>>>>
>>>>>> include ${PETSC_DIR}/lib/petsc/conf/rules
>>>>>> include ${PETSC_DIR}/lib/petsc/conf/test
>>>>>>
>>>>>>
>>>>>> Best not to set these values in the makefile at all because they will
>>>>>> affect all compilers. Just set them with ./configure CCOPTFLAGS="-O3
>>>>>> -march=native"
>>>>>>
>>>>>>
>>>>>>
>>>>>> 4. I have no such processors. Where can I find benchmark information
>>>>>> about STREAMS?
>>>>>>
>>>>>>
>>>>>> do make mpistreams in PETSC_DIR
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks,
>>>>>> Hyung Kim
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2023년 1월 2일 (월) 오후 11:03, Matthew Knepley <knepley at gmail.com>님이 작성:
>>>>>>
>>>>>>> On Mon, Jan 2, 2023 at 4:16 AM 김성익 <ksi2443 at gmail.com> wrote:
>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> Happy new year!!
>>>>>>>>
>>>>>>>>
>>>>>>>> I have some questions about “Hint for performance tuning” in user
>>>>>>>> guide of petsc.
>>>>>>>>
>>>>>>>>
>>>>>>>> 1. In the “Performance Pitfalls and Advice” section, there are
>>>>>>>> 2 modes “debug” and “optimized builds. My current setup is debug mode. So I
>>>>>>>> want to change for test the performance the optimized build mode. However,
>>>>>>>> if I configure again, does the existing debug mode disappear? Is there any
>>>>>>>> way to coexist the 2 modes and use them in the run the application?
>>>>>>>>
>>>>>>> Suppose your current arch is named "arch-main-debug". Then you can
>>>>>>> make an optimized version using
>>>>>>>
>>>>>>> cd $PETSC_DIR
>>>>>>> ./arch-main-debug/lib/petsc/conf/reconfigure-arch-main-debug.py
>>>>>>> --with-debugging=0 --PETSC_ARCH=arch-main-opt
>>>>>>>
>>>>>>>
>>>>>>>> 2. In the guide, there are some paragraphs about optimization
>>>>>>>> level of compiler. To control the optimization level of compiler, I put the
>>>>>>>> ‘-O3’ as below. Is this right??
>>>>>>>> CFLAGS = -O3
>>>>>>>> FFLAGS =
>>>>>>>> CPPFLAGS =
>>>>>>>> FPPFLAGS =
>>>>>>>>
>>>>>>>>
>>>>>>>> app : a1.o a2.o a3.o a4.o
>>>>>>>> $(LINK.C) -o $@ $^ $(LDLIBS)
>>>>>>>>
>>>>>>>>
>>>>>>>> include ${PETSC_DIR}/lib/petsc/conf/rules
>>>>>>>> include ${PETSC_DIR}/lib/petsc/conf/test
>>>>>>>>
>>>>>>>
>>>>>>> You could dp this, but that only changes it for that directory. It
>>>>>>> is best to do it by reconfiguring.
>>>>>>>
>>>>>>>
>>>>>>>> 3. In the guide, user should put ‘-march=native’ for using
>>>>>>>> AVX2 or AVX-512. Where should I put the ‘-march=native’ for using AVX?
>>>>>>>>
>>>>>>> You can add --COPTFLAGS="<user flags>" with any flags you want to
>>>>>>> the configure.
>>>>>>>
>>>>>>> 4. After read the “Hint for performance tuning” I understood
>>>>>>>> that for good performance and scalability user should use the multiple node
>>>>>>>> and multiple socket . However, before composing cluster system, many users
>>>>>>>> just can use desktop system.
>>>>>>>> In that case, between intel 13th i9 and amd ryzen 7950x, can the
>>>>>>>> 7950x, which has an arichitecture similar to the server processor, be more
>>>>>>>> suitable for petsc? (Because the architecture of intel desktop cpu is
>>>>>>>> big.little.)
>>>>>>>>
>>>>>>>
>>>>>>> A good guide is to run the STREAMS benchmark on the processor. PETSc
>>>>>>> performance closely tracks that.
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Matt
>>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>>
>>>>>>>> Hyung Kim
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> What most experimenters take for granted before they begin their
>>>>>>> experiments is infinitely more interesting than any results to which their
>>>>>>> experiments lead.
>>>>>>> -- Norbert Wiener
>>>>>>>
>>>>>>> https://www.cse.buffalo.edu/~knepley/
>>>>>>> <http://www.cse.buffalo.edu/~knepley/>
>>>>>>>
>>>>>>
>>>>>>
>>>
>>> --
>>> What most experimenters take for granted before they begin their
>>> experiments is infinitely more interesting than any results to which their
>>> experiments lead.
>>> -- Norbert Wiener
>>>
>>> https://www.cse.buffalo.edu/~knepley/
>>> <http://www.cse.buffalo.edu/~knepley/>
>>>
>>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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